PS238 Version Issue Date File Name Total Pages : A.001 : 2008/05/05 : SP-PS238-A.001.doc : 11 8-Channel Secondary Monitoring IC 新竹市科學園區展業一路 9 號 7 樓之 1 SILICON TOUCH TECHNOLOGY INC. 9-7F-1, Prosperity Road I, Science Based Industrial Park, Hsin-Chu, Taiwan 300, R.O.C. Tel：886-3-5645656 Fax：886-3-5645626 PS238 PS238 8-Channel Secondary Monitoring IC General Description PS238 is specially designed for switching power supply system. Four important functions of PS238 are the followings: over-voltage protection, over-current protection, under-voltage protection and power good signal generating. OVP/UVP (Over-Voltage/Under-Voltage Protection) monitors 3.3V, 5V and six 12V to protect our power supply and PC, FPO/ goes to high when one of these supply voltages exceeds their normal operation voltage range. OCP (Over Current Protection) monitors IS33, IS5, IS12A, IS12B, IS12C, IS12D, IS12E, IS12F input current sense. An adjustable over-current condition composed of Iref and “protection current range resistor” helps users design OCP easily. An additional protection input pin provides the flexibility for design protection circuit. Power good signal generating notifies personal computer when power supply is ready or power supply is going to shutdown, therefore it can provide a reliable power supply environment. Features • • • • • • • • • • Over/Under-voltage protection and lock out Over-current protection and lock out Additional protection input Fault protection output with open drain output stage Open drain power good output signal for power good input Built-in 300mS power good delay AC on 75ms delay for UV/OC protection 38mS PSON/ control de-bounce Wide power supply range (4.2V~16V) Special care for AC power off Version：A.001 8-Channel Seccondary Monitoring IC -1- PS238 Block Diagram FPO/ delay VS VS12A VS12B VS12C VS12D VS12E VS12F S Q 155KΩ R 17uS 1MΩ UV Vref 9KΩ Vref 16KΩ delay 38mS De-bounce OV H: 4mS L : 4.5uS VCC 30KΩ 2K Ω VCCI PSON/ 12OV 1.25V 90KΩ 4.5V 12UV VS5 58KΩ 5 UV delay 13.5KΩ Vref 5 OV PGI Selection PGI>0.63V H: 75mS L : 4.5uS PGI<0.63V H:500mS L : 4.5uS 18.5KΩ Vref PGI VS33 38.5KΩ 3.3 UV 23.5KΩ Vref VCCI 3.3 OV 28KΩ Vref 1MΩ PGO delay 73uS De-bounce H: 300mS L : 4.5uS VCCI VS IS IS12A IS12B IS12C IS12D IS12E IS12F Step Down to near 2.5V OC delay delay Pext Iref X8 2.5V 3.4mS 3.4mS 12 OC VCCI IS5 Step Down to near 2.5V Power On Reset delay 5 OC H : 20mS L : 4.5uS POR Internal Power Constant Current Source Iref RI VCCI = 4V VCC Iref X8 VCC VCCI IS33 Step Down to near 2.5V Band_Gap Reference 3.3 OC Vref 1.25V Clock Generator CLK GND Iref X8 Version：A.001 8-Channel Seccondary Monitoring IC -2- PS238 Timing Chart Vcc PSON/ FPO/ PGI VS12A VS12B VS12C VS12D VS12E VS12F VS5 VS33 Pext IS12A IS12B IS12C IS12D IS12E IS12F IS5 IS33 PGO Td1 Tb1 Td3 Td2 AC turn on VPGI UVP/OVP/OCP Pext protect PSON/ turn on PSON/ turn off PSON/ turn on AC turn off 1.25V 1.13V 0.63V Td1 Td2 OVP OVP/UVP/OCP OVP Version：A.001 8-Channel Seccondary Monitoring IC -3- PS238 Pin Descriptions Pin No 1 PIN NAME PGI Descriptions Power good input signal pin 2 GND Ground 3 FPO/ Inverted fault protection output ,open drain output stage 4 PSON/ Remote ON/OFF control input pin 5 IS12A 12V(1) over current protection input pin 6 RI 7 IS12B 12V(2) over current protection input pin 8 VS12B 12V(2) over/under voltage protection input pin 9 VS12C 12V(3) over/under voltage protection input pin 10 VS12D 12V(4) over/under voltage protection input pin 11 VS12E 12V(5) over/under voltage protection input pin 12 VS12F 12V(6) over/under voltage protection input pin 13 IS12F 12V(6) over current protection input pin 14 IS12E 12V(5) over current protection input pin 15 IS12D 12V(4) over current protection input pin 16 IS12C 12V(3) over current protection input pin 17 Pext External protection detect input pin 18 IS5 5.0V over current protection input pin 19 IS33 3.3V over current protection input pin 20 VS12A 21 VS33 3.3V over/under voltage protection input pin 22 VS5 5.0V over/under voltage protection input pin 23 VCC Power supply 24 PGO Power good output signal pin , open drain output stage Current sense setting 12V(1) over/under voltage protection input pin 1 PGI PGO 24 2 GND VCC 23 3 FPO/ VS5 22 4 PSON/ VS33 21 5 IS12A VS12A 20 6 RI IS33 19 7 IS12B IS5 18 8 VS12B Pext 17 9 VS12C IS12C 16 10 VS12D IS12D 15 11 VS12E IS12E 14 12 VS12F IS12F 13 PS238 Version：A.001 8-Channel Seccondary Monitoring IC -4- PS238 Absolute Maximum Ratings Parameter Storage Temperature Rating Unit (Tstg) -40 to +125 °C Operating Temperature (Topr) -30 to +90 °C VCC -0.5 to +16.0 V VS12,IS12(A,B,C,D,E,F) -0.5 to +16.0 V VS5, IS5 -0.5 to +9.0 V VS33, IS33 -0.5 to +7.0 V PGI -0.5 to +16.0 V PSON/, Pext -0.5 to Vcc+0.5 V FPO/ -0.5 to +16.0 V PGO -0.5 to Vcc+0.5 V RI 12.5 to 62.5 uA Supply Voltage (VCC) Input Voltage Range (VI) Output Voltage Range (VO) Output Current for RI (IRI) Electrical Characteristics, Vcc=12V, Ta = 25°C. (Unless otherwise specified) Power Supply Section Parameter Conditions Supply Voltage MIN 4.2 Supply Current Power On Reset Hysteresis (VHYST) MAX Unit 5.0 16.0 V 4.5 5.0 mA 3.0 3.4 3.6 V -0.15 -0.3 -0.45 V VPSON/ = 5V Power On Reset Threshold Voltage (VPOR) TYP Over-Voltage Section Parameter Conditions MIN TYP MAX Unit VS33 3.7 3.9 4.1 V VS5 5.7 6.1 6.5 V VS12A/B/C/D/E/F 13.1 13.8 14.5 V Over-Voltage Threshold Under-Voltage Section Parameter Conditions MIN TYP MAX Unit VS33 2.0 2.2 2.4 V VS5 3.3 3.5 3.7 V VS12A/B/C/D/E/F 8.5 9.0 9.5 V Under-Voltage Threshold Version：A.001 8-Channel Seccondary Monitoring IC -5- PS238 Electrical Characteristics (Continued) Over-Current Section Parameter Offset Voltage Conditions MIN TYP VS33, VS5 -3 0 3 mV VS12A/B/C/D/E/F -3 0 4 mV RI=62.5KΩ 148 160 172 uA Conditions MIN TYP MAX IS33, IS5 OCP Bias Current IS12A/B/C/D/E/F MAX Unit PGI, Analog Input Parameter Unit Threshold Voltage for start Td1 1.16 1.25 1.33 V Threshold Voltage for start Td2 0.60 0.63 0.75 V Threshold Voltage for mask OC,UV 1.05 1.13 1.21 V +/-50 +/-80 mV +/-20 Hysteresis (VHYST)* * All of the comparator for PGI input in block diagram. PGO, Open Drain Digital Output Parameter Conditions Leakage Current (ILKG) VPGO=5V Low Level Output Voltage (VOL) ISINK=10mA MIN TYP MAX Unit 5 uA 0.3 V FPO/, Open Drain Digital Output Parameter Conditions Leakage Current (ILKG) VFPO/=5V Low Level Output Voltage (VOL) ISINK=20mA MIN TYP MAX Unit 5 uA 0.4 V PSON/, Digital Input Parameter Conditions MIN TYP MAX Unit Threshold Voltage ( High ) 1.40 1.50 1.60 V Threshold Voltage ( Low ) 0.75 0.85 0.95 V Version：A.001 8-Channel Seccondary Monitoring IC -6- PS238 Electrical Characteristics (Continued) External Protection Detect Section Parameter Conditions MIN TYP MAX Unit VCC=12V 2.4 2.5 2.6 V +/-10 +/-20 +/-50 mV MIN TYP MAX Unit Threshold(VTH) Hysteresis (VHYST) Switching Characteristics, Vcc=12V, Ta = Full range. Parameter Conditions PGI to PGO Delay Time (Td1) 200 300 480 mS Short Circuit Delay Time (Td2) PGI> 0.63V 49 75 100 mS Short Circuit Delay Time (Td2-1) PGI< 0.63V 400 500 600 mS PGO to FPO/ Delay Time (Td3) 2 4 6 mS Under Voltage Delay Time (Td4) 2 3.4 4 mS Over Current Delay Time (Td5) 13 20 27 mS Over Voltage Delay Time (Td6) 9 17 25 uS Pext Delay Time (Td7) 2 3.4 4 mS PSON/ De-bounce Time (Tb1) 24 38 52 mS PGO Noise De-glitch Time (Tb2) 47 73 110 uS Version：A.001 8-Channel Seccondary Monitoring IC -7- PS238 Application Typical 8 rails SPS S.P.S. Secondary Side RS5 +12V(1) Output R S12(2) +12V(2) Coil +12V(2) Output R S12(3) +12V(3) Coil +12V(3) Output R S12(4) +12V(4) Coil +12V(4) Output R S12(5) +12V(5) Coil +12V(5) Output R S12(6) +12V(6) Coil +12V(6) Output R OC12(6) R OC12(5) R OC12(4) R OC12(3) ROC5 R OC12(1) ROC33 R OC12(2) or +3.3V Output R S12(1) +12V(1) Coil = +5V Output RS33 +3.3V Coil RPGO 4.7K 1 PGI PGO 24 2 GND Vcc 23 3 FPO/ +5VSB PGO SB +5V VS5 22 1K 4 PSON/ PSON VS33 21 0.1u 5 IS12A VS12A 20 6 RI 0.1u IS33 19 Cby 0.1u IS5 18 7 IS12B RI CPGI 8 VS12B Pext 17 9 VS12C IS12C 16 10 VS12D IS12D 15 11 VS12E IS12E 14 12 VS12F IS12F 13 PS238 0.1u Pext 0.1u 0.1u 0.1u 0.1u Notes: 1. Zener diode or resistor or both of them can be used in component X. 2. The bypass capacitor Cby suggests to be 0.1uF~ 10uF and layout nearby pin VCC. 3. The recommend sense values of RS12(1), RS12(2), RS12(3), RS12(4), RS12(5), RS12(6), RS5 and RS33 are ≥ 0.002Ω. 4. Over-Current Protection design example: V 1.25 (1) I ref = 20 μA , RI = RI = = 62.5 K (Ω ) I RI 20μ (2) RS5=0.002 Ω , ΔV5V = 0.002 × I +5V = ROC 5 × 8 × I ref (3) If +5V OCP trip point is 20A, ROC 5 = 0.002 × 20 = 250(Ω ) 8 × 20 μ Version：A.001 8-Channel Seccondary Monitoring IC -8- PS238 Package Specification (24pin DIP ) E1 E eB θ° D A2 A Seating Plane A1 b1 e b 0 5 0.0 Symbol A A1 A2 b b1 D E E1 e eB L S θ° Dimension in mm Min Normal Max 5.334 0.381 3.175 3.302 3.429 1.524 0.457 31.242 31.750 32.512 7.620 BSC 6.426 6.553 6.680 2.540 8.509 9.017 9.525 2.921 3.302 3.810 0 7 15 L S 10 15 0.5 Dimension in inch Min Normal Max 0.210 0.015 0.125 0.130 0.135 0.060 0.018 1.230 1.250 1.280 0.300 BSC 0.253 0.258 0.263 0.100 0.335 0.355 0.375 0.115 0.130 0.150 0 7 15 20 25 mm 1.0 inch NOTE Version：A.001 8-Channel Seccondary Monitoring IC -9- PS238 The products listed herein are designed for ordinary electronic applications, such as electrical appliances, audio-visual equipment, communications devices and so on. Hence, it is advisable that the devices should not be used in medical instruments, surgical implants, aerospace machinery, nuclear power control systems, disaster/crime-prevention equipment and the like. Misusing those products may directly or indirectly endanger human life, or cause injury and property loss. Silicon Touch Technology, Inc. will not take any responsibilities regarding the misusage of the products mentioned above. Anyone who purchases any products described herein with the above-mentioned intention or with such misused applications should accept full responsibility and indemnify. Silicon Touch Technology, Inc. and its distributors and all their officers and employees shall defend jointly and severally against any and all claims and litigation and all damages, cost and expenses associated with such intention and manipulation. Silicon Touch Technology, Inc. reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. Version：A.001 8-Channel Seccondary Monitoring IC -10-